Gorgo said..
My understanding of double skin parawings is you lose bottom end but you gain a heap of top end and better upwind performance.
There's another issue with some double skin wings, such as the Hybrid, that have mesh on the trailing edge drains. If your wing gets swamped in a shore break sand can get washed into the wing but there's no easy way for the wet sand to come out again. There can be kilos of sand inside the wing.
It took me 2-3 days of drying out the wing and manually chasing it out before I got all the sand out. The best way was to shake it all to one tip, reach in and grab that tip holding it bunched, then pull the tip out and dump the sand. Repeat as many times as necessary.
There's two solutions to this problem. One is for the wing to have an open sand/water drain big enough to let out large chunks of debris. The other is to paddle out well away from shore and into clean wind before launching the wing.
Hybrid has semi-opening following the whole centre part... No mesh.